Satellite radio fans are well aware the service offers a lot of choice, whether you're into a specific decade ('80s, '90s, etc.), genre (such as reggae or metal) or personality (Howard Stern or Martha Stewart).

But a new feature called MySXM offers a lot more personalization for those who stream content from the SiriusXM Internet Radio app for iOS and Android, and siriusxm.com.

Specifically, SiriusXM subscribers can now tweak the kind of music they want to hear within an existing channel. For example, while streaming the channel SiriusXM Hits 1 (for Top 40 pop music), you can use your finger to drag a slider from "Hot Hits" (existing chart-toppers) to "Hit Bound" (newer tunes). Or you might select more "Pop & Rock" over "Pop & Rhythm." Or choose "Less Teen Pop" over "More Teen Pop" if you've had your fill of One Direction and Justin Bieber.

Another example: The Lithium channel, which delivers '90s alternative music, has sliders for "Deeper versus Familiar" (more pop or more obscure), "More Grunge versus Less Grunge" and "Harder versus Softer."

Because it's a slider bar, you're not limited to a "yes" or "no" decision on the style or popularity of the music you're listening to – but rather, varying grades for each choice, such as 75 percent one way or another.

More than 50 SiriusXM stations now have this MySXM feature. If the station supports it, you'll see a white icon with the word "My" in the middle of it. While streaming music from the app, the icon is on the right-hand side of your smartphone or tablet screen (or web browser). Tap it to open up the slider bars, make your selections and save your preferences by tapping Apply. At any time you can toggle between the live channel broadcast and your customized channel.

MySXM also works with a couple of comedy channels. In Raw Dog Comedy, for instance, you can drag a slider between "Established Comedians" and "Emerging Comedians," "Topical" material or more "Observational," and "Pre-2010" versus "Post-2010."

While this new feature works for the most part, there were a few of questionable picks based on our testing (on an iPad mini). For example, while listening to the SiriusXM Love station, you can choose more male or female artists -- but while I dragged the slider all the way over to Male, I heard Heart's Ann Wilson singing. Occasional hiccups aside, MySXM is a welcomed addition to the app and website.

Other features of the SiriusXM Internet Radio app: listen to channels live, including some online-only exclusives (such as Red White & Booze, with music from country-themed bars); hear shows and songs from the beginning whenever you switch to a new channel; pause, rewind and fast-forward through live radio and on-demand content (with some restrictions); and store some talk and entertainment content to listen to offline.

Subscription costs for SiriusXM satellite radio starts at $14.49 per month, plus access to the app is an additional $3.50 a month. Alternatively, users can subscribe to SiriusXM Internet Radio without needing a satellite radio for $14.49 a month.